Study On Rain Garden Design Under Low Impact Development

With the continuous expansion of urban construction,the development intensity and the continuous increase of urban population,a series of urban ecological problems such as urban water shortage,water pollution and frequent waterloggings and so on become increasingly prominent,seriously restricting the sustainable development of China's cities.In order to solve the increasingly acute urban water environment problems,the state vigorously promote the construction of sponge city,emphasizing the drainage by natural forces in a slow and sustained way,so as to let the city be close to nature.As "cell body" of a sponge city,the rain garden is the main carrier of rainwater resources,and the effective control means of urban rainwater management,which is used to deal with urban ground runoff,collect rainwater,purify rainwater,and help rainwater penetrate ground to return to natural water cycle playing its excellent functions,but also has excellent landscape art value.This chapter followed the research logic of "asking questions-analyzing problems-solving problems".Firstly,it analyzed the main water environment problems faced by cities in China,and systematically analyzed the relationship between the development of low-impact development and sponge city construction.Based on the theory of low-impact development,the design strategy of rain garden and the countermeasures of different types of rain garden are studied,and the results are verified by design practice.This study has important theoretical value and positive practical significance for promoting the sustainable development of urban ecosystem.Chapter 1,the introductory part.Based on the research background of urban water environment,and sponge city construction,this paper summarized the research trends at home and abroad,and clarified the purpose,significance,content and method of the research,and laid the foundation for the smooth development of the article.Chapter 2,the basic theoretical research section.First of all,from five aspects this paper analyzed the article's entry point-low impact development concept.And then from three aspects this paper explored the article's research theme-rain garden.Finally,the inner relationship between these two is discussed from two aspects.Chapter 3,the design strategy and application strategy.The design strategy of rain garden under the concept of low impact development was studied.The key research contents included the design principles,special design and construction process of rain garden based on the low impact development concept,and summarized the design strategies and points of different types of rain gardens in combination with the domestic and international award winning practice cases.Chapter 4,a practical study.Through the actual engineering design,the research points of the rain garden in the lake area of Binhu strip,Fuxian Lake tourist resort areas are studied,and the conclusion of the above research is verified.Chapter 5,the conclusion part.This paper summarized the full text,drew the main conclusions,analyzed the shortages,and clearly provided follow-up research content.Finally,reflection and outlook of the garden in China's development are given.